Search for pulsars with periods of more than two seconds at declinations from +21${}^o$ to +42${}^o$

Abstract

A search was carried out for pulsars with periods (P) from 2 to 90 s in daily observations carried out over an interval of 5 years in a area measuring 6300 sq.deg. The data was obtained on a Large Phased Array (LPA) at a frequency of 111 MHz. The periodograms calculated using the Fast Folding Algorithm (FFA) were used for the search. To increase the sensitivity, the periodograms obtained in different observation sessions were added together. Of the 14 known pulsars that entered the study area, with periods of P>2 s and dispersion measures (DM) less than 200 pc/cm${}^3$, 9 were detected. 2 new pulsars have been found. The mean profiles of pulsars are obtained and estimates of their flux densities are given. The open pulsar J1951+28, with a period of P = 7.3342 s and DM = 3.5 pc/cm${}^3$, turned out to be one of the pulsars closest to the Sun. The absence of new pulsars with periods of tens of seconds with a search sensitivity of 1 mJy outside the Galactic plane indicates a low probability of the existence of pulsars with extremely long periods. Most likely, the recently found sources of periodic radiation with periods from a minute to tens of minutes are white dwarfs.

8 pages, 4 figures, 1 table. Published in Astronomy Reports, translated by Yandex translator with correction of scientific lexis

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